A:
Positive:
1 x 6435217155 x 12870434323 x 2797920531 x 20758765115 x 5595841155 x 4151753713 x 9025553565 x 180511
Negative:
-1 x -643521715-5 x -128704343-23 x -27979205-31 x -20758765-115 x -5595841-155 x -4151753-713 x -902555-3565 x -180511
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 643,521,715, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 643,521,715 | |
| -1 | -643,521,715 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 643,521,715.
Example:
1 x 643,521,715 = 643,521,715
and
-1 x -643,521,715 = 643,521,715
Notice both answers equal 643,521,715
With that explanation out of the way, let's continue. Next, we take the number 643,521,715 and divide it by 2:
643,521,715 ÷ 2 = 321,760,857.5
If the quotient is a whole number, then 2 and 321,760,857.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 643,521,715 | |
| -1 | -643,521,715 |
Now, we try dividing 643,521,715 by 3:
643,521,715 ÷ 3 = 214,507,238.3333
If the quotient is a whole number, then 3 and 214,507,238.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 643,521,715 | |
| -1 | -643,521,715 |
Let's try dividing by 4:
643,521,715 ÷ 4 = 160,880,428.75
If the quotient is a whole number, then 4 and 160,880,428.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 643,521,715 | |
| -1 | 643,521,715 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 31 | 115 | 155 | 713 | 3,565 | 180,511 | 902,555 | 4,151,753 | 5,595,841 | 20,758,765 | 27,979,205 | 128,704,343 | 643,521,715 |
| -1 | -5 | -23 | -31 | -115 | -155 | -713 | -3,565 | -180,511 | -902,555 | -4,151,753 | -5,595,841 | -20,758,765 | -27,979,205 | -128,704,343 | -643,521,715 |
Here are some more numbers to try:
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